Bitcoin's 25 per cent weekly rally has not fixed the arithmetic that broke the mining industry: cash costs sit near $88,000 a coin and MARA, Riot and CleanSpark are all still trading on negative earnings.
Bitcoin opened Tuesday at $78,982 and touched $81,023 within hours, closing out a seven-day advance of roughly 25 per cent. The three largest listed miners in the United States are burning cash at every one of those prices.
Marathon Digital trades at $11.26 with a trailing price-to-earnings ratio of -1.3 and a free cash flow yield of -29.7 per cent. Riot Platforms is at $19.83 on a -5.6 P/E and -12.7 per cent FCF yield. CleanSpark, the operator most often held up as the disciplined survivor, closed at $11.98 with a -3.0 P/E and -22.4 per cent FCF yield. Every one of those figures ends in a minus sign because the underlying business, at the network's current difficulty, does not produce a coin cheaply enough to sell it into this rally at a profit.
The math traces back to the April 2024 halving, which cut the block reward from 6.25 to 3.125 BTC. That single change doubled the effective cost of producing a coin overnight, and difficulty has climbed since. Coin Metrics and other trackers put the weighted-average cash cost across public miners near $80,000 per bitcoin in the fourth quarter of last year; JPMorgan's March research put the all-in figure closer to $88,000 for the first quarter of 2026. Bitcoin at $81,000 clears the electricity-only breakeven that most mid-tier operators quote near $74,000, but that is a shutdown price, not a sustainable one. It ignores the depreciation on ASIC fleets bought in a bull market and the interest on the debt used to build the sites.
CleanSpark's own numbers illustrate the gap. Revenue fell 30.5 per cent year-on-year to $138 million in fiscal third-quarter 2026, and the company swung to a $239.8 million net loss from a $257.4 million profit in the same quarter a year earlier. The chief executive spent much of the earnings call framing the miner as a data-centre developer for AI and HPC that also happens to mine bitcoin. Riot has run the same reframing exercise since it leased 191 megawatts of its bitcoin site to Anthropic, and MARA is now marketing 4.8 gigawatts of land pipeline into the same customer set. That is the strategic answer to a broken block-reward economy: dilute the exposure to the coin.
The market has not rewarded the pivot equally. Riot has run roughly 58 per cent year-to-date, Marathon staged a 16 per cent catch-up move in the past week, and CleanSpark is down 5 per cent over the same window. The dispersion looks like it should track hosting deals and treasury sales, and to a first approximation it does. Riot's rerating started once the Anthropic contract quantified the AI opportunity in megawatts and dollars. CleanSpark, which has held to a bitcoin-first message longer than its peers, has not had the same catalyst.
Everyone is doing the same thing at the treasury level. BitFuFu sold 184 bitcoin in the second quarter to fund operations as cloud mining revenue fell 74 per cent. American Bitcoin trimmed its Q2 loss to $57 million on record mined output. MARA pledged more than half of its bitcoin treasury against a Texas gas plant bid. Each of those moves reads as balance-sheet housekeeping, but the pattern is unified: producing bitcoin is not paying for itself, and the sector is monetising every other asset it has to buy time.
There is a scenario where a further leg higher rescues the incumbents. Hash price near $36-38 per petahash per second per day sits close to breakeven for the efficient operators, and a sustained bitcoin price above $95,000 would push most public miners back into positive gross margins even after this year's difficulty adds. That is not this week's story. This week's story is that bitcoin has done what its holders wanted and the companies whose whole business model is minting the asset are still selling every coin they produce at a loss.
The next test is the third-quarter print in November. Difficulty is up 14 per cent from the year's low but still off the April high, and hash price has climbed on the back of the rally. Whether that translates to the first positive free-cash-flow quarter since the halving depends on whether operators keep the discipline they have shown on selling coins into strength. A sector that spent 2026 rebranding itself as an AI compute play does not have many rebrands left.
